{
  "bibcode": "2017GCN.21843....1I",
  "body": "L. Izzo, A. de Ugarte Postigo, D.A. Kann (IAA-CSIC/HETH) report on behalf of a larger collaboration:\n\nWe observed the field of GRB 170906C (Siegel et al., GCN 21826) with the T24 (Plane Wave CDK 0.61m) of the iTelescope.Net (http://www.itelescope.net) located at Auberry, CA. A set of 3 images of 300 s each were taken in the I filter, starting at 10:30:39 UT, ~ 2.9 hours after the GRB trigger.\n\nWe do not detect any source inside the XRT refined error region (Evans et al., GCN 21831) and estimate a 3-sigma upper limit of I > 19.0",
  "circularId": 21843,
  "createdOn": 1504778325000,
  "email": "Luca.Izzo@ICRA.it",
  "subject": "GRB 170906C: optical observations",
  "submitter": "Luca Izzo at IAA-CSIC  <Luca.Izzo@ICRA.it>",
  "eventId": "GRB 170906C"
}